How can regular expressions (preg_match) be a useful tool for extracting specific parts of a string in PHP, and what are some best practices for using them in this context?

Regular expressions (preg_match) can be a useful tool for extracting specific parts of a string in PHP by allowing you to define a pattern to match against the string. This can be helpful for tasks such as extracting email addresses, phone numbers, URLs, or any other specific data within a larger string. Best practices for using regular expressions in this context include being mindful of the complexity of the pattern, testing thoroughly with different scenarios, and considering performance implications when working with large amounts of data.

$string = "Hello, my email is example@email.com";
$pattern = '/[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/'; // Pattern to match an email address
if (preg_match($pattern, $string, $matches)) {
    echo "Email found: " . $matches[0];
} else {
    echo "Email not found";
}